[JAN3 CEO Criticizes Bitcoin Quantum Security Proposal as Too Hasty: Blind Upgrades Could Trigger Classical Computing Attack Risks] Deep Tide TechFlow reports, on April 5, JAN3 CEO Samson Mow posted on the X platform stating that the current response to the quantum computing (QC) threat to Bitcoin should not be rushed. Hastily switching from the existing signature mechanism to a post-quantum (PQ) solution could instead expose Bitcoin to risks of classical computing attacks in the short term. PQ signatures could increase in size by 10 to 125 times, significantly reducing network throughput and potentially reigniting expansion debates similar to the early "block size wars." Additionally, Samson Mow warned that some PQ solutions might carry potential backdoor risks. The quantum computing threat remains a mid-to-long-term issue (possibly requiring 10 to 20 years), and the more reasonable approach at present is to continue research rather than rushing deployment. He also specifically called out Coinbase, stating that its wallet's address reuse poses a quantum attack vulnerability and recommended prioritizing the resolution of related infrastructure issues.